WHSmith plc (also known as WHS or colloquially as Smith's) is a British retailer which operates a chain of high street, railway station, airport, port, hospital and motorway service station shops selling books, stationery, magazines, newspapers and entertainment products. Its headquarters are in Swindon, Wiltshire. Smith's is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index. It was the first chain store company in the world, and was responsible for the creation of the ISBN book catalogue system.

William Henry Smith PC (24 June 1825 – 6 October 1891) was an English bookseller and newsagent of the family firm W H Smith, who expanded the firm and introduced the practice of selling books and newspapers at railway stations. He was elected a Member of Parliament in 1868 and rose to the position of First Lord of the Admiralty less than ten years thereafter. Because of his lack of naval experience, he was perceived as a model for the character Sir Joseph Porter in H.M.S. Pinafore. In the mid-1880s, he was twice Secretary of State for War, and later First Lord of the Treasury and Leader of the House of Commons, among other posts.